New Delhi, March 3: The Supreme Court today asked the Centre, all states and Union territories and the National Commission for Protection of Child Rights to respond to a plea to stop schools from discriminating against HIV-positive students or children of afflicted parents. Such discrimination is widespread, the petition filed by the NGO Naz Foundation said, listing a series of incidents reported from states like Bengal, Odisha, Kerala, Karnataka and Maharashtra, among others. Justices B.S. Chauhan and J. Chelameshwar issued notices to all the governments and the child rights panel and sought their replies within four weeks.